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Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 11,505,673 $ 11,333,431
Unrealized Losses 318,861 133,558
Estimated Fair Value 11,934,562 12,380,071
% of Total 100.00% 100.00%
Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 19,917,350 19,559,432
Unrealized Gains 1,683,234 2,864,436
Unrealized Losses 311,476 132,254
Estimated Fair Value 21,289,108 22,291,614
% of Total 100.00% 100.00%
Other-than-temporary impairments in AOCI (4,168) (8,625)
Equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 149,108 217,046
Unrealized Gains 5,187 6,958
Unrealized Losses 7,385 1,304
Estimated Fair Value 146,910 222,700
% of Total 100.00% 100.00%
Corporate securities | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,505,673 11,333,431
Unrealized Gains 637,691 1,085,973
Unrealized Losses 208,802 39,333
Estimated Fair Value 11,934,562 12,380,071
% of Total 56.10% 55.50%
Other-than-temporary impairments in AOCI 0 0
Canadian and Canadian provincial governments | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,719,147 2,676,777
Unrealized Gains 785,840 1,372,731
Unrealized Losses 13,831 174
Estimated Fair Value 3,491,156 4,049,334
% of Total 16.40% 18.20%
Other-than-temporary impairments in AOCI 0 0
Residential mortgage-backed securities | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 922,581 969,267
Unrealized Gains 44,948 76,520
Unrealized Losses 15,691 3,723
Estimated Fair Value 951,838 1,042,064
% of Total 4.50% 4.70%
Other-than-temporary impairments in AOCI (300) (241)
Asset-backed securities | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 883,495 700,455
Unrealized Gains 19,264 19,898
Unrealized Losses 17,481 28,798
Estimated Fair Value 885,278 691,555
% of Total 4.10% 3.10%
Other-than-temporary impairments in AOCI (2,259) (2,259)
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,371,473 1,608,376
Unrealized Gains 102,207 142,369
Unrealized Losses 20,566 51,842
Estimated Fair Value 1,453,114 1,698,903
% of Total 6.80% 7.60%
Other-than-temporary impairments in AOCI (1,609) (6,125)
US government and agencies | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 413,254 231,256
Unrealized Gains 20,412 33,958
Unrealized Losses 2,819 24
Estimated Fair Value 430,847 265,190
% of Total 2.00% 1.20%
Other-than-temporary impairments in AOCI 0 0
State and political subdivisions | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 288,757 270,086
Unrealized Gains 22,626 38,058
Unrealized Losses 13,654 5,646
Estimated Fair Value 297,729 302,498
% of Total 1.40% 1.40%
Other-than-temporary impairments in AOCI 0 0
Other foreign government, supranational and foreign government-sponsored enterprises | Fixed maturity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,812,970 1,769,784
Unrealized Gains 50,246 94,929
Unrealized Losses 18,632 2,714
Estimated Fair Value 1,844,584 1,861,999
% of Total 8.70% 8.30%
Other-than-temporary impairments in AOCI 0 0
Nonredeemable Preferred Stock [Member] | Equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 80,985 68,469
Unrealized Gains 5,187 6,542
Unrealized Losses 3,333 170
Estimated Fair Value 82,839 74,841
% of Total 56.40% 33.60%
Other equity securities | Equity securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 68,123 148,577
Unrealized Gains 0 416
Unrealized Losses 4,052 1,134
Estimated Fair Value $ 64,071 $ 147,859
% of Total 43.60% 66.40%